CA2672646C - Resistive implant welding for structural bonds in automotive applications - Google Patents

Resistive implant welding for structural bonds in automotive applications Download PDF

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Publication number
CA2672646C
CA2672646C CA2672646A CA2672646A CA2672646C CA 2672646 C CA2672646 C CA 2672646C CA 2672646 A CA2672646 A CA 2672646A CA 2672646 A CA2672646 A CA 2672646A CA 2672646 C CA2672646 C CA 2672646C
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CA
Canada
Prior art keywords
tailgate
polymer material
conductor
flanges
moulded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA2672646A
Other languages
French (fr)
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CA2672646A1 (en
Inventor
Steve Grgac
David Denis Rouison
Martin R. Mcleod
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magna International Inc
Original Assignee
Magna International Inc
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Filing date
Publication date
Application filed by Magna International Inc filed Critical Magna International Inc
Publication of CA2672646A1 publication Critical patent/CA2672646A1/en
Application granted granted Critical
Publication of CA2672646C publication Critical patent/CA2672646C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/344—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint being a woven or non-woven fabric or being a mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3034—Particular design of joint configurations the joint involving an anchoring effect making use of additional elements, e.g. meshes
    • B29C66/30341—Particular design of joint configurations the joint involving an anchoring effect making use of additional elements, e.g. meshes non-integral with the parts to be joined, e.g. making use of extra elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3008—Instrument panels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

A fused component having a first portion and second portion made of polymer material. Between the first portion and second portion is a conductor and a weld line is formed between said first portion and said second portion along the surface area of the conductor. The weld line has a strength of equal to or greater than 800 psi. The fused component formed can be any type of automotive component such as a tailgate, running board, roof rail, liftgate, or front end carrier.

Description

RESISTIVE IMPLANT WELDING FOR STRUCTURAL BONDS IN
AUTOMOTIVE APPLICATIONS
FIELD OF THE INVENTION
The present invention relates to the use of resistive implant welding for structural welds in automotive applications.
BACKGROUND OF THE INVENTION
The joining together of two or more plastic components to form a weld or joint is frequently required during the manufacturing automobile components.
As the use of plastic material in automotive applications increases there exists a greater need for more ways of welding together such components. One particular requirement is that the weld formed must have a sufficient amount of weld strength. In particular, in vehicle tailgates, such as pick-up truck tailgates the component must be designed to withstand great loads. In order to meet load requirements, composite tailgates are designed as a hollow structure having several reinforcement ribs and flange supports in combination with reinforcement sheets. For tailgates that are formed of thermoplastic composites, the various reinforcement sheets and supportive ribs of the tailgate are fused together using adhesives specially formulated to have high weld strength. The use of such adhesives does add to the length of the manufacturing time due to the time it takes to cure the weld. Also, the adhesives can be costly and contribute to the overall cost of producing the tailgate. Yet other adhesives are less costly and have a faster cure time, they require surface treatments (e.g., corona treatment or plasma treatment) to increase the surface energy of welding faces. These surface treatments are a secondary operation and difficult to control and increase part cost. Therefore, there exists a need to form welds between thermoplastic components that will
- 2 -decrease manufacturing time by reducing the time needed to form the weld, as well as eliminate costly adhesives.
SUMMARY OF THE INVENTION
A fused component having a first portion and second portion made of polymer material. Between the first portion and second portion is a conductor and a weld line is formed between said first portion and said second portion along the surface area of the conductor. The weld line has a strength of equal to or greater than 800 psi. The fused component formed can be any type of automotive component such as a tailgate, running board, roof rail, liftgate, front end carrier, decorative panels or airbag deployment doors.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
Fig. 1 is a perspective view of an exemplarily resistive implant welding machine;
Fig. 2 is a perspective close up view of a fused component being formed in the resistive implant welding machine;
Fig. 3 is a perspective view of a fused component formed as one half of a vehicle tailgate;
Fig. 4 is a cross-sectional view of a first component being fused to a second component; and Fig. 5 is a plan side view of a first component being fused to a second component.
- 3 -DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Referring now to Figs. 1-2 a method for forming a fused or welded component using resistive implant welding is depicted. A fused component is shown in a resistive implant welding machine 12. The resistive welding machine 12 has an upper platen 14 capable of moving vertically with respect to the fused component 10. The resistive implant welding machine 12 also 10 has a lower platen 16 upon which the fused component 10 rests and is formed. When the fused component 10 is to be welded the upper platen 14 will move vertically and press down against the fused component 10 and apply pressure.
Fig. 2 shows a close up view wherein the upper platen 14 is pressed down against the fused component 10. The fused component 10 has a first portion 18, a second portion 20 and a conductor 22 placed between the first portion 18 and the second portion 20. The first portion 18 and second portion can take many shapes and forms depending upon the particular application of the invention. This will be discussed in greater detail with 20 reference to Figs. 4-5.
The conductor 22 comes into contact with an energy source 24 which can be copper contacts or conductors that energize the conductor 22. The conductor 22 can be wire mesh or some other type of electrically conductive material capable of generating heat when an electrical current is applied.
Additionally the conductor 22 can be a single wire. When the upper platen 14 moves down and compresses the first portion 18 and second portion 20 the energy source 24 applies energy to the conductor 22 which causes the conductor to heat up. The heating of the conductor 22 causes portions 18 and 20 to start melting. The pressure applied forces the molten portions 18 and 20 to flow around a wire conductor or through a wire mesh, mixing the two materials together. The heat generated by the conductor 22 combined with the pressure applied by the upper platen 14 to the lower platen 16 causes the weld line to form.
- 4 -The conductor 22 will remain in the fused component 10 at the weld line. After the pressing and energizing operation has occurred for a predetermined time period the first portion 18 and second portion 20 will be allowed to solidify by cooling to form a weld line. The weld line formed between the first portion 18 and second portion 20 will have a high weld strength, that has been shown to be equal or greater than the type of weld strength obtained using adhesives or mechanical fasteners. Furthermore, the manufacturing time for forming the weld between the first portion 18 and second portion 20 is much shorter than the manufacturing time forming a similar weld using adhesives.
Referring to Fig. 3 a view of a moulded tailgate is shown wherein the first portion 18 is the moulded tailgate portion and the second portion 20 is a reinforcement sheet that strengthens the fused component 10. The first portion 18 has tailgate flanges 26 extending from the first portion 18. The second portion 20 or reinforcement sheet is placed across one or more of the tailgate flanges 26. The conductor (not shown) is placed along the contact area between the tailgate flanges 26 and the second portion 20. The weld line is formed along the length of the surface area of the conductor 22. The placement of the reinforcement sheet strengthens the fused component. For example, a tailgate as moulded in a manner described with respect to the present application can withstand loads greater or less than 2,200 lbs.
However, 2,200 lbs. is merely exemplary number and depending on the specification the load can be greater or lesser.
Referring now to Fig. 4 a cross-sectional view of a portion of the tailgate shown in Fig. 3 is shown. The first portion 18 is a moulded tailgate portion having tailgate flanges 26 extending upward from the surface. The second portion 20 is resistive implant welded onto the first portion. The upper platen 14 is shown and applies pressure during the moulding process. In this particular application rigid supports 28 are inserted under portions of the tailgate flanges in order to facilitate and even the weld of the first portion 18 to the second portion 20. The rigid supports 28 can be removed after the welding process is complete. A weld line 30 is formed between the tailgate flanges 26 and the second portion 20. Although the use of rigid supports 28
- 5 -are described above, it is not necessary to use them in all applications. It is possible to form weld without the use of rigid supports 28.
Fig. 5 shows an alternate embodiment of the invention wherein there are no tailgate flanges 26; instead a U-Shaped second portion 32 is welded onto the first portion 18 which is a moulded tailgate. This particular embodiment eliminates the need for using rigid supports 28. The upper platen 14 is modified to fit around the U-Shaped second portion 32 and apply pressure at the appropriate location where a weld line 34 between the first portion 18 and the U-Shaped second portion 32 is desired.
The embodiment disclosed in Figs. 4 and 5 can be used in other applications besides forming tailgates; it is possible to form any type of structural plastic parts. For example, in both applications set forth in Figs.
4 and 5, the first portion 18 can be a moulded liftgate, while the second portion 20 or U-Shaped second portion 32 can be a reinforcement sheet or a moulded reinforcement for a moulded liftgate. Another application involves the first portion 18 being a top half of a running board while the second portion 20 or U-Shaped second portion 32 can be the bottom half of a running board.
In another application the first portion 18 can be one half of a roof rail while the second portion 20 or U-Shaped second portion 32 can be a second half of a roof rail. In yet another application of the present invention, the first portion 18 can be a carrier module for a vehicle front end, while the second potion 20 or U-Shaped second portion 32 can be a resistively implant welded support beam. The invention described above can also be used to form airbag deployment chutes to instrument panel toppers or for welding decorative appliques or exterior skins to panels, running boards, liftgates or tailgates, thus eliminating the need for using fasteners and/or adhesives.
The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the scope of the invention.

Claims (4)

Claims What is claimed is:
1. A moulded tailgate made of polymer material for a pick-up truck being manufacturable in a resistive welding machine having an upper platen and a lower platen and comprising:
a first portion made of polymer material having one or more tailgate flanges made of polymer material extending from the first portion;
a second portion made of polymer material and forming a reinforcement sheet placed across the one or more tailgate flanges;
a conductor placed along a contact area between the one or more tailgate flanges and said second portion; and a weld line created along a surface of the conductor between said one or more tailgate flanges and said second portion, wherein a combined structure made of polymer material including said first portion, said second portion, said one or more tailgate flanges and said weld line form a moulded tailgate for a pick-up truck designed to withstand forces equal to or greater than 2,200 lbs.
2. The moulded tailgate made of polymer material for a pick-up truck according to claim 1, wherein the flanges of the first portion made of polymer material are incorporated in the second portion made of polymer material forming a "U"
shaped second portion made of polymer material.
3. The moulded tailgate made of polymer material for a pick-up truck according to any one of claims 1 or 2, wherein said conductor is wire mesh capable of conducting energy and said wire mesh is embedded within said weld line.
4. The moulded tailgate made of polymer material for a pick-up truck according to any one of claims 1 or 2, wherein said conductor is wire mesh capable of conducting energy and facilitating the welding of said first portion and said second portion.
CA2672646A 2006-12-22 2007-12-20 Resistive implant welding for structural bonds in automotive applications Expired - Fee Related CA2672646C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/644,209 US20080152919A1 (en) 2006-12-22 2006-12-22 Resistive implant welding for structural bonds in automotive applications
US11/644,209 2006-12-22
PCT/CA2007/002335 WO2008077249A1 (en) 2006-12-22 2007-12-20 Resistive implant welding for structural bonds in automotive applications

Publications (2)

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CA2672646A1 CA2672646A1 (en) 2008-07-03
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EP2117879B1 (en) 2017-09-06
CA2672646A1 (en) 2008-07-03
EP2117879A4 (en) 2014-05-21
US20080152919A1 (en) 2008-06-26
WO2008077249A1 (en) 2008-07-03
EP2117879A1 (en) 2009-11-18
CN101563256A (en) 2009-10-21
CN101563256B (en) 2012-07-18
JP2010513068A (en) 2010-04-30
JP5571959B2 (en) 2014-08-13

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